Underpinning of existing foundations to remedy subsidence or increase load capacity. Covers mass concrete, beam and base, and mini-pile systems to structural engineer specification.
Typical cost
£1,200 — £3,500
Typical duration
1-2 weeks
Certificate
Building Regulations approval required
Scope type
flexible
Typical tasks
Expose existing foundation in sections
Excavate to new bearing depth in sequence
Pour mass concrete or install piles per engineer spec
Allow to cure and backfill
Monitor and report on completion
Extras & additional works
Based on underpinning a standard section of foundation, costs may increase if access is difficult or additional structural work is required.
Common questions Stainesai
The cost of underpinning is affected by the size of the area, soil conditions, access to the site, and any additional structural requirements.
Yes, underpinning is covered by Building Regulations as it involves structural work. Approval from your local authority is required.
Signs that a property may need underpinning include cracks in walls, doors or windows not closing properly, and visible movement in the structure.
Underpinning involves excavating sections of the foundation, pouring concrete or installing piles to a new depth, and allowing it to cure before backfilling.
In most cases, you can remain in your home during underpinning, but there may be some disruption. Always confirm with your tradesperson before work begins.
Ready to post a underpinning job?
Describe what you need. Stainesai structures it into a proper scope. Your first job post is free.